I just finished spraying my bumper today. It's SPI Dark Red base and their Universal Clear. I can call this Matador Red since that's what SPI based their Dark Red formula on. SPI Universal Clear is a flexible clear so no flex agent is necessary using on an Endura bumper.
This was my final fit before disassembling for paint:
After blasting the bumper, I started off with 4 coats of SPI epoxy primer. I then installed back on the car and used the 3M epoxy filler to fit it to the fenders. 3 more coats of SPI epoxy primer after that.
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